diff --git a/packages/store/src/keys/checkKey.js b/packages/store/src/keys/checkKey.js
index debc0c6bff5..c20cbdff9ce 100644
--- a/packages/store/src/keys/checkKey.js
+++ b/packages/store/src/keys/checkKey.js
@@ -1,5 +1,7 @@
 // @ts-check
 
+import '@endo/marshal/exported.js';
+
 /// <reference types="ses"/>
 
 import {